Project Configuration

Relevant source files

• Cargo.toml

This document covers the project configuration of the lazyinit crate, focusing on package metadata, licensing strategy, dependency management, and no-std compatibility. The configuration is primarily defined in Cargo.toml and establishes the crate's minimal design philosophy and broad compatibility requirements.

For information about the core implementation details, see LazyInit Implementation. For development tooling and CI configuration, see Development & Contributing.

Configuration Structure

The project configuration follows a minimal approach with clear separation of concerns between package metadata, dependencies, and build targets.

Package Configuration Hierarchy

flowchart TD
subgraph Dependencies["Dependencies"]
    N["Empty - no dependencies"]
end
subgraph subGraph1["Package Metadata"]
    C["name = lazyinit"]
    D["version = 0.2.1"]
    E["edition = 2021"]
    F["authors"]
    G["description"]
    H["license"]
    I["homepage"]
    J["repository"]
    K["documentation"]
    L["keywords"]
    M["categories"]
end
subgraph Cargo.toml["Cargo.toml"]
    A["[package]"]
    B["[dependencies]"]
end

A --> C
A --> D
A --> E
A --> F
A --> G
A --> H
A --> I
A --> J
A --> K
A --> L
A --> M
B --> N

Sources: Cargo.toml(L1 - L15) 

Package Metadata

The package metadata defines the crate's identity, versioning, and discoverability characteristics.

Sources: Cargo.toml(L1 - L12) 

Keywords and Categories

The crate is tagged with specific keywords and categories that indicate its purpose and compatibility:

• Keywords: lazy, initialization, static
• Categories: no-std, rust-patterns

These classifications signal the crate's focus on lazy initialization patterns and its compatibility with no-std environments.

Sources: Cargo.toml(L11 - L12) 

Licensing Strategy

The project employs a tri-license approach providing flexibility for different use cases and legal requirements.

Multi-License Configuration

flowchart TD
subgraph subGraph2["Use Cases"]
    E["Open Source Projects"]
    F["Commercial Software"]
    G["Chinese Legal Framework"]
end
subgraph subGraph1["License Options"]
    B["GPL-3.0-or-later"]
    C["Apache-2.0"]
    D["MulanPSL-2.0"]
end
subgraph subGraph0["lazyinit Crate"]
    A["license field"]
end

A --> B
A --> C
A --> D
B --> E
C --> F
D --> G

The license string GPL-3.0-or-later OR Apache-2.0 OR MulanPSL-2.0 allows users to choose the most appropriate license for their specific requirements:

• GPL-3.0-or-later: Copyleft license for open source projects
• Apache-2.0: Permissive license suitable for commercial use
• MulanPSL-2.0: License compatible with Chinese legal frameworks

Sources: Cargo.toml(L7) 

No-std Compatibility

The configuration explicitly supports no-std environments through strategic design choices.

Zero-Dependency Architecture

flowchart TD
subgraph subGraph2["Enabled Environments"]
    G["std environments"]
    H["no-std environments"]
    I["embedded systems"]
    J["kernel modules"]
end
subgraph subGraph1["Core Rust"]
    C["core library"]
    D["AtomicBool"]
    E["UnsafeCell"]
    F["MaybeUninit"]
end
subgraph subGraph0["lazyinit Crate"]
    A["[dependencies]"]
    B["Empty section"]
end

A --> B
B --> C
C --> D
C --> E
C --> F
D --> G
D --> H
D --> I
D --> J

The empty [dependencies] section indicates that the crate relies exclusively on Rust's core library, enabling usage in:

• Embedded systems without heap allocation
• Kernel modules and OS development
• WebAssembly environments
• Any no-std compatible Rust project

Sources: Cargo.toml(L14 - L15) 

Build Target Compatibility

The configuration supports the crate's multi-target compatibility strategy, as evidenced by the CI pipeline testing multiple architectures.

Target Architecture Support

The configuration's minimal dependencies and no-std categorization enable this broad target support without requiring target-specific conditional compilation.

Sources: Cargo.toml(L12) 

Configuration Philosophy

The project configuration reflects several key design principles:

1. Minimalism: Zero external dependencies reduce attack surface and compatibility issues
2. Flexibility: Multi-licensing accommodates diverse legal requirements
3. Universality: No-std compatibility enables use across all Rust environments
4. Clarity: Explicit categorization and keywords aid discoverability

This configuration strategy aligns with the crate's role as a fundamental building block for lazy initialization patterns across the Rust ecosystem.

Sources: Cargo.toml(L1 - L15)